Strap

ABSTRACT

A strap comprising a main body portion formed in a belt shape and provided with a first loopback end portion formed by intermediate portion being looped back; and a locking mechanism provided with a first support portion slidably supports one region of the main body portion viewed from the first loopback end portion, and a second support portion supports an end portion provided at an opposite side from the first loopback end portion on an other region, and the locking mechanism being switchable between a free state and a locked state.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a strap.

2. Description of Related Art

Heretofore, as straps attached to cameras, binoculars and the like,straps formed such that length adjustments are performed with ease havebeen known (see, for example, Japanese Unexamined Patent Publication No.2006-87470).

With the above-mentioned conventional straps, it is difficult to performlength adjustments in a state in which, for example, the strap is hunground a neck or the like.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a strap that enableslength adjustments to be performed with ease.

The present invention solves the above-described problem with thefollowing solution. Here, for ease of understanding, descriptions willbe given with reference numerals according to embodiments of the presentinvention assigned, but these are not to be limiting.

An invention of claim 1 is a strap (1) comprising: a main body portion(21) formed in a belt shape and provided with a first loopback endportion (21 b) formed by a length direction intermediate portion beinglooped back; and a locking mechanism provided with a first supportportion (25) that slidably supports one region of the main body portionviewed from the first loopback end portion, and a second support portion(25 a) that supports an end portion provided at an opposite side fromthe first loopback end portion on an other region of the main bodyportion, and the locking mechanism (24) being switchable between a freestate, in which sliding between the one region and the first supportportion is enabled, and a locked state, in which the sliding isrestricted.

The invention of claim 2 is a strap (1) according to claim 1, whereinthe end portion provided at the opposite side from the first loopbackend portion (21 b) on the other region is supported at the secondsupport portion in a state in which relative movement with respect tothe second support portion in the length direction of the main bodyportion (21) is restricted.

The invention of claim 3 is a strap according to claim 1 or 2, furthercomprising: a hanging portion (10) formed in a belt shape and used bybeing hung round the body of a user; and a third support portion (22)that slidably supports the first loopback end portion (21 b) and isconnected to an end portion of the hanging portion, wherein in the mainbody portion (21), an end portion provided at the opposite side from thefirst loopback end portion on the one region is connected to anattachment object (100), and the locking mechanism (24) is provided tobe relatively movable with respect to the third support portion alongthe length direction of the main body portion.

The invention of claim 4 is a strap (2) according to claim 1, furthercomprising: a hanging portion (10) formed in a belt shape and used bybeing hung round the body of a user; and a third support portion (42)that slidably supports the first loopback end portion (41 b) and isconnected to an end portion of the hanging portion, wherein the secondsupport portion (45 a) slidably supports a second loopback end portion(41 c) which is formed by a length direction intermediate portion of theother region of the main body portion being looped back, in the mainbody portion, an end portion provided at the opposite side from thefirst loopback end portion viewed from the second loopback end portionon the other region is supported at the third support portion, and anend portion provided at the opposite side from the first loopback endportion on the one region is connected to an attachment object (100),and the locking mechanism (44) is provided to be relatively movable withrespect to the third support portion along the length direction of themain body portion.

The invention of claim 5 is a strap (4) according to claim 4, whereinthe second support portion (65 a) is provided with a first roller (65 a)that is turnable about an axis parallel with a width direction of themain body portion (61), and the second loopback end portion (61 c) ofthe main body portion is wound on an outer peripheral surface of thefirst roller.

The invention of claim 6 is a strap according to any one of claim 3 toclaim 5, wherein the third support portion (62) is provided with asecond roller that is turnable about an axis parallel with a widthdirection of the main body portion (61), and the first loopback endportion (61 b) of the main body portion is wound on an outer peripheralsurface of the second roller (62 b).

According to the present invention, a strap that enables lengthadjustments to be performed with ease can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A and FIG. 1B are views showing examples of a usage example of afirst embodiment of a strap, showing a state in which a camera is hunground the neck of a user via the strap;

FIG. 2A to FIG. 2D are views showing a first extensible portion providedat the strap shown in FIG. 1;

FIG. 3A to FIG. 3D are views showing a second embodiment of the strap;

FIG. 4A and FIG. 4B are views showing a third embodiment of the strap;and

FIG. 5A and FIG. 5B are views showing a fourth embodiment of the strap.

DETAILED DESCRIPTION OF THE INVENTION First Embodiment

Herebelow, embodiments of a strap employing the present invention willbe described with reference to the attached drawings. The followingembodiments are described with a strap for a camera being taken as anexample of the strap.

FIG. 1A and FIG. 1B are views showing examples of a usage example of afirst embodiment of the strap, showing a state in which, using thestrap, the camera is hung round the neck of a user. FIG. 1A shows astate in which the overall length of the strap is longer than in FIG.1B.

The overall shape of a strap 1 is a belt shape. One length direction endportion thereof is connected to one side face of a camera 100, and theother length direction end portion is connected to another side face ofthe camera 100. In FIG. 1A and FIG. 1B, the strap 1 is used with alength direction middle portion being hung round the neck of a user.However, the strap 1 may be hung round another portion of the body foruse, such as a shoulder of a user 200.

The strap 1 is provided with a hanging portion 10, a first extensibleportion 20, which connects one end portion of the hanging portion 10with the camera 100, and a second extensible portion 30, which connectsanother end portion of the hanging portion 10 with the camera 100.

The hanging portion 10 is a belt-form member formed of, for example, achemical fiber material or the like. As shown in FIG. 1A and FIG. 1B, asubstantially central portion in the length direction thereof is hunground the neck or the like of the user 200 for use.

As shown in FIG. 2A to FIG. 2D, a loopback end portion 11 is provided atthe one end portion of the hanging portion 10. The loopback end portion11 is formed by being looped back such that one face region thereofopposes itself. At the loopback end portion 11, the opposing faceregions are fixed, for example, by being sewn together, and the endportion of the hanging portion 10 is formed into a loop. Although notillustrated, the hanging portion 10 is also provided with a loopbackportion formed into a loop at the other end portion thereof.

Next, the structure of the first extensible portion 20 will bedescribed.

FIG. 2A to FIG. 2D are plan views and sectional views showingenlargements of the first extensible portion provided at the strap shownin FIG. 1A and FIG. 1B. FIG. 2A and FIG. 2B show a state in which theoverall length of the strap is longer than in FIG. 2C and FIG. 2D. FIG.2A and FIG. 2C are the plan views and FIG. 2B and FIG. 2D are thesectional views, of a width direction central portion.

As shown in FIG. 1A to FIG. 2D, one end portion of the first extensibleportion 20 is connected to the camera 100, and the other end portion isconnected to the one end portion of the hanging portion 10 (the loopbackend portion 11).

The first extensible portion 20 is provided with a main body portion 21,a connection portion 22, a first adjuster 23 and a second adjuster 24.

The main body portion 21 is a belt-form member formed of, for example, achemical fiber material or the like.

A loopback end portion 21 a is provided at one end portion (the camera100 side) of the main body portion 21. The loopback end portion 21 a isformed by the main body portion 21 being looped back such that one faceregion thereof (hereinafter referred to as the rear face region) opposesitself. Thus, the one end portion of the main body portion 21 is formedinto a loop.

A ring-form member known as an eyelet 101 is provided at a side face ofthe camera 100. The loopback end portion 21 a of the main body portion21, which is formed into the above-described loop, passes through theeyelet 101.

A loopback end portion 21 b is also provided at the other end portion(the hanging portion 10 side) of the main body portion 21. The loopbackend portion 21 b is formed by the rear face region of the main bodyportion 21 being looped back so as to oppose itself. Thus, the other endportion of the main body portion 21 is also formed into a loop.

The connection portion 22 is a member that connects the main bodyportion 21 with the hanging portion 10, and is formed in a rectangularring shape of, for example, a synthetic resin material. Both of theloopback end portion 11 of the hanging portion 10 and the loopback endportion 21 b of the main body portion 21, which are formed into loops,are passed through this connection portion 22. The connection portion 22slidably supports the loopback end portion 11 of the hanging portion 10and the loopback end portion 21 b of the main body portion 21.

The first adjuster 23 is for controlling (adjusting) the lengthdirection dimension of the first extensible portion 20, and is providedin a region of the first extensible portion 20 at the camera 100 sidethereof.

The first adjuster 23 is provided with a main frame portion 23 a, whichis formed in a rectangular ring shape, and a support portion 23 b, whichis a rod-form portion provided spanning between opposing edge portionsof the main frame portion 23 a. The support portion 23 b is provided tobe substantially parallel with the width direction of the strap 1.

The first adjuster 23 is, for example, a molded product formed of asynthetic resin material, and the main frame portion 23 a and supportportion 23 b are integrally formed.

A doubled-over region (to which the reference numeral A1 is assigned inFIG. 2B) is formed in a region at the camera 100 side of the main bodyportion 21 by the formation of the loopback end portion 21 a. Thisdoubled-over region A1 is wound on the support portion 23 b of the firstadjuster 23. The overall length of the first extensible portion 20 canbe changed by changing the length of the doubled-over region A1.

At the first adjuster 23, when a tension force acts in the lengthdirection of the main body portion 21, the doubled-over region A1presses the main frame portion 23 a and the support portion 23 b indifferent directions from one another. At this time, friction force isgenerated at the rear face region of the main body portion 21. Thus, themain body portion 21 of the first extensible portion 20 is preventedfrom disengaging from the first adjuster 23.

Similarly to the first adjuster 23, the second adjuster 24 is foradjusting the length direction dimension of the main body portion 21,and is provided in a region of the main body portion 21 at the hangingportion 10 side thereof.

The second adjuster 24 is provided with a base portion 25 and a leverportion 26.

The base portion 25 is a rectangular board-form member disposed tooppose the rear face region of the main body portion 21. The baseportion 25 is provided with a long hole portion, through which the mainbody portion 21 can pass, in the vicinity of an end portion at thehanging portion 10 side thereof. A support portion 25 a, which is formedin a rod shape, is formed at the hanging portion 10 side end portion ofthe base portion 25.

The lever portion 26 is formed in a rectangular board shape, and thefaces of both sides of one end vicinity thereof are supported at thebase portion 25 via a shaft portion 26 a. The lever portion 26 ismovable between a locking position, at which the lever portion 26opposes the base portion 25, and a free position, to which the leverportion 26 is turned about the shaft portion 26 a from the lockingposition. In FIG. 2A to FIG. 2D, the lever portion 26 in the freeposition is shown by solid lines and the lever portion 26 in the lockingposition is shown by broken lines.

The above-described main body portion 21 passes between the base portion25 and the lever portion 26, and the base portion 25 functions as afirst support portion.

The lever portion 26 is provided with a pawl portion 26 b, which isprovided protruding toward the base portion 25 from the face region thatopposes the base portion 25, in the vicinity of the shaft portion 26 a.In a free state, the pawl portion 26 b is withdrawn from the path ofpassage of the main body portion 21, and relative movement of the mainbody portion 21 and the second adjuster 24 along the length direction ofthe main body portion 21 is enabled. In contrast, in a locked state, thepawl portion 26 b protrudes into the path of passage of the main bodyportion 21, and presses the main body portion 21 to the base portion 25.In the locked state, the pawl portion 26 b meshes with the main bodyportion 21. This is a locked state in which the main body portion 21 islocked (anchored) with respect to the base portion 25 by friction forcebetween the main body portion 21 and the pawl portion 26 b.

Now, as described above, the loopback end portion 21 b that is formed bylooping back a length direction intermediate portion of the main bodyportion 21 is provided at the hanging portion 10 side end portion of themain body portion 21.

Viewed from the loopback end portion 21 b, one region of the main bodyportion 21 (to which the reference numeral B1 is assigned in FIG. 2B andFIG. 2D) passes between the base portion 25 and the lever portion 26 asdescribed above, and another region (to which the reference numeral B2is assigned in FIG. 2B and FIG. 2D) is looped back toward the camera 100in parallel with the one region B1.

A length direction intermediate portion of the other region B2 is woundon the support portion 25 a of the base portion 25 and looped backtoward the connection portion 22 (toward the loopback end portion 21 b).Thus, the support portion 25 a functions as a second support portion.Herebelow, description will be given with a region, of the other regionB2, from the loopback end portion 21 b to the portion that is loopedback at the support portion 25 a being referred to as a region C1, and aregion from the portion that is looped back at the support portion 25 ato the distal end portion of the main body portion 21 that is providedin the other region B2 being referred to as a region C2 (see FIG. 2B).

The region C2 is disposed between the region C1 and the one region B1,and is fixed to the region C1 by, for example, sewing together. Thus,the other region B2 of the main body portion 21 is supported at the baseportion 25 of the second adjuster 24 in a state in which relativemovement in the length direction of the strap 1 with respect to thesecond adjuster 24 is restricted.

As shown in FIG. 1A and FIG. 1B, the second extensible portion 30 isprovided with a similar structure to the first extensible portion 20 (amain body portion 31, a connection portion 32, a first adjuster 33 (notillustrated), and a second adjuster 34), and descriptions thereof willnot be given here.

Next, a method of use of the first embodiment of the strap 1 isdescribed.

The present embodiment of the strap 1 may be used with the overalllength of the strap 1 being set to an arbitrary length between the stateshown in FIG. 1A (a state in which the overall length of the strap islengthened) and the state shown in FIG. 1B (a state in which the overalllength of the strap is shortened).

Herebelow, operations of the first extensible portion 20 are described.However, the same operations may be performed on the second extensibleportion 30 in conjunction with operations of the first extensibleportion 20.

When switching from the state shown in FIG. 1A in which the overalllength of the strap is long to the state shown in FIG. 1B in which theoverall length of the strap is shortened, the locked state of the secondadjuster 24 is released, and the second adjuster 24 in this releasedstate is moved downward (toward the camera). In this operation, thesecond adjuster 24 alone is gripped and moved downward, without thecamera 100 or the hanging portion 10 being touched.

When the second adjuster 24 moves downward (toward the camera 100) withrespect to the connection portion 22, the loopback end portion 21 b ofthe main body portion 21 slides through the connection portion 22, andthe overall length of the other region B2 viewed from the loopback endportion 21 b is lengthened. Correspondingly, the overall length of theone region B1 viewed from the loopback end portion 21 b is shortened.Thus, the one region B1 is drawn into the other region B2, a length ofoverlapping of the one region B1 and the other region B2 becomes longer,and the overall length of the first extensible portion 20 becomesshorter (see FIG. 2C and FIG. 2D).

When the overall length of the strap 1 reaches a desired length byshortening of the overall length of the first extensible portion 20, theuser operates the lever portion 26 of the second adjuster 24 and putsthe second adjuster 24 into the locked state. In the locked state of thesecond adjuster 24, sliding between the main body portion 21 and thesecond adjuster 24 is restricted. Therefore, the overall length of thestrap 1 is maintained at the above-mentioned desired length.

Further, when switching from the state shown in FIG. 1B in which theoverall length of the strap is short to the state shown in FIG. 1A inwhich the overall length of the strap is lengthened, the locked state ofthe second adjuster 24 is released, and the second adjuster 24 in thisreleased state is moved upward (toward the hanging portion 10). Hence,when the overall length of the strap 1 reaches a desired length, theuser operates the lever portion 26 and puts the second adjuster 24 intothe locked state.

According to the above-described present embodiment of the strap 1, thefollowing effects can be provided.

(1) The second adjuster 24 can switch between the free state and thelocked state at arbitrary positions (arbitrary positions in the lengthdirection of the main body portion 21). Therefore, the user 200 canarbitrarily adjust the length of the strap 1 for use, for example, tosuit their body shape or the like.

(2) The operation of adjusting the length of the strap 1 is carried outby gripping and operating only the second adjuster 24, without touchingthe hanging portion 10, the main body portion 21 of the extensibleportion (the first extensible portion 20 or the second extensibleportion 30) or the camera 100 with the hands. Therefore, the operationis easy.

(3) There is no free end of the first extensible portion 20 (or thesecond extensible portion 30) at the hanging portion 10 side end portionthereof. Therefore, when the length of the strap 1 is shortened, anexcess portion including a free end is not produced, and takeup of thestrap 1 is better.

Second Embodiment

Next, a second embodiment of the strap employing the present inventionwill be described. In this second embodiment and in other embodiments tobe described later, portions performing functions the same as in theabove-described first embodiment are assigned the same referencenumerals, or reference numerals with matching suffixes, and duplicativedescriptions and drawings are omitted as appropriate.

FIG. 3A to FIG. 3D are views showing an extensible portion provided inthe second embodiment of the strap.

A strap 2 of this second embodiment differs from the strap 1 of thefirst embodiment in the structure of a connection portion 42, whichconnects the hanging portion 10 with a first extensible portion 40, andin the structure of a second adjuster 44, which is the lockingmechanism. Herebelow, these differences will be described.

Whereas the connection portion 22 of the first embodiment is arectangular ring, that is, a ring with a single hole, the connectionportion 42 of the second embodiment is provided with two hole portionsarranged along the length direction of the strap 2, and three rod-formportions are provided along the length direction of the strap 2.Herebelow, descriptions are given with the rod-form portions beingreferred to, from the hanging portion 10 side, as a first supportportion 42 a, a second support portion 42 b and a third support portion42 c.

The loopback end portion 11 provided at the hanging portion 10 is woundon the first support portion 42 a of the connection portion 42.

A loopback end portion 41 b, which is provided between the one region B1and the other region B2 of a main body portion 41, is wound on thesecond support portion 42 b.

Now, in the first embodiment, the region C2 included in the other regionB2 is fixed to the first region C1 that is disposed to oppose the same.However, in this second embodiment, the other region B2 is looped backtoward the connection portion 42 from a support portion 45 a of thesecond adjuster 44, and the other region B2 is then wound on the thirdsupport portion 42 c of the connection portion 42, and is looped backtoward the second adjuster 44 (toward the camera 100).

Herebelow, descriptions will be given with a region, of the other regionB2 of the main body portion 41, from the loopback end portion 41 b tothe portion that is looped back at the support portion 45 a beingreferred to as a first region C1, a region from the portion that islooped back at the support portion 45 a to the portion that is loopedback at the third support portion 42 c being referred to as a region C2,and a region from the portion that is looped back at the third supportportion 42 c to a distal end portion of the main body portion 41 beingreferred to as a region C3. The region C3 is disposed between the regionC1 and the region C2, and is fixed to the region C2 by, for example,sewing together.

Similarly to the strap 1 of the first embodiment, the second embodimentof the strap is switched from the state shown in FIG. 3A and FIG. 3B tothe state shown in FIG. 3C and FIG. 3D (see FIG. 1B) by the secondadjuster 44 moving downward (toward the camera 100).

Here, when the second adjuster 44 is moving toward the camera 100, theconnection portion 42 itself does not move but the second adjuster 44moves with respect to the connection portion 42. When the distancebetween the connection portion 42 and the second adjuster 44 isincreased, the loopback end portion 41 b of the main body portion 41correspondingly slides round the second support portion 42 b of theconnection portion 42, and a loopback end portion 41 c formed betweenthe region C2 and the region C3 slides round the support portion 45 a ofa base portion 45. Thus, the one region B1 is drawn into the otherregion B2, and the lengths of the region C1 and the region C2 arelengthened. Meanwhile, the length of the region B1 is shortened, and theoverall length of the first extensible portion 40 is shortened.

In the strap 1 of the first embodiment shown in FIG. 2A to FIG. 2D, amovement amount of the second adjuster 24 with respect to the connectionportion 22 and an amount of change in the length of the first extensibleportion 20 are substantially the same. However, in the strap 2 of thepresent second embodiment, the length of the first extensible portion 40lengthens or shortens with the amount of change being about twice themovement amount of the second adjuster 44.

Therefore, the overall length of the strap 2 can be changed with smalleroperation amounts. Therefore, operations of changing the length of thestrap 2 can be performed more quickly.

Third Embodiment

Next, a third embodiment of the strap employing the present inventionwill be described.

FIG. 4A and FIG. 4B are views showing the third embodiment of the strap.

A strap 3 of the third embodiment is a variant embodiment of the strapof the first embodiment, and is provided with a roller 52 a at a portionat which a connection portion 52, which connects a first extensibleportion 50 with the hanging portion 10, slidably supports a loopback endportion 51 b of a main body portion 51. The rotation axis of this roller52 a is parallel with the width direction of the strap 3. The loopbackend portion 51 b of the main body portion 51 is wound on the outerperipheral surface of the roller 52 a.

This third embodiment of the strap 3 can moderate the friction forcegenerated between the main body portion 51 and the connection portion 52when the same are sliding. Therefore, length adjustment of the strap 3can be performed more easily, and usability is improved.

Fourth Embodiment

Next, a fourth embodiment of the strap employing the present inventionwill be described.

FIG. 5A and FIG. 5B are views showing the fourth embodiment of thestrap.

A strap 4 of the fourth embodiment is a variant embodiment of the strap2 of the second embodiment, and is provided with a roller 62 d at which,similarly to the above-described third embodiment, a connection portion62 slidably supports a loopback end portion 61 b of a main body portion61. The strap 4 is further provided with a roller 65 a at a portion, ofa base portion 65 of a second adjuster 64, that supports a loopback endportion 61 c of the main body portion 61.

Similarly to the third embodiment, the strap 4 of the fourth embodimentenables changes of the length of the strap 4 with smaller forces.

Variant Embodiments

The present invention is not limited to the embodiments describedhereabove; various alterations and modifications are possible, and thesefall within the technical scope of the present invention.

(1) The constitution of the strap of the present invention is notlimited to the constitutions recited in the embodiments, and suitablemodifications are possible. For example, the straps of the embodimentsare provided with extensible portions at both of the end portions of thehanging portion, but this is not limiting. An extensible portion may beprovided only at one end portion of the hanging portion.

Further, the strap itself may have the constitution of an extensibleportion of the embodiments. For example, in the first embodiment of thestrap, one eyelet of the camera is connected to one end of the main bodyportion, and the hanging portion is connected to the other end. However,another eyelet may be connected to the other end. Further, a state ispossible in which, while one end of the main body portion is connectedto the eyelet, the other end is not connected to anything.

(2) The straps of the embodiments are attached to a camera. However, anattachment object to which the strap of the present invention isattached is not limited thus. For example, the attachment object may beoptical equipment such as a pair of binoculars or the like, and may beportable electronic equipment such as a portable telephone or the like.Further, the attachment object may be something such as a bag. The strapemploying the present invention may be used for the hanging strap of ashoulder bag or the like, the shoulder straps of a rucksack or the like,and so forth.

(3) The locking mechanism of the embodiments has a locked state in whicha pawl portion meshes with the strap. However, the constitution of thelocking mechanism is not limited thus.

1. A strap comprising: a main body portion formed in a belt shape andprovided with a first loopback end portion formed by a length directionintermediate portion being looped back; and a locking mechanism providedwith a first support portion that slidably supports one region of themain body portion viewed from the first loopback end portion, and asecond support portion that supports an end portion provided at anopposite side from the first loopback end portion on an other region ofthe main body portion, and the locking mechanism being switchablebetween a free state, in which sliding between the one region and thefirst support portion is enabled, and a locked state, in which thesliding is restricted.
 2. The strap according to claim 1, wherein theend portion provided at the opposite side from the first loopback endportion on the other region is supported at the second support portionin a state in which relative movement with respect to the second supportportion in the length direction of the main body portion is restricted.3. The strap according to claim 1, further comprising: a hanging portionformed in a belt shape and used by being hung round the body of a user;and a third support portion that slidably supports the first loopbackend portion and is connected to an end portion of the hanging portion,wherein in the main body portion, an end portion provided at theopposite side from the first loopback end portion on the one region isconnected to an attachment object, and the locking mechanism is providedto be relatively movable with respect to the third support portion alongthe length direction of the main body portion.
 4. The strap according toclaim 1, further comprising: a hanging portion formed in a belt shapeand used by being hung round the body of a user; and a third supportportion that slidably supports the first loopback end portion and isconnected to an end portion of the hanging portion, wherein the secondsupport portion slidably supports a second loopback end portion which isformed by a length direction intermediate portion of the other region ofthe main body portion being looped back, in the main body portion, anend portion provided at the opposite side from the first loopback endportion viewed from the second loopback end portion on the other regionis supported at the third support portion, and an end portion providedat the opposite side from the first loopback end portion on the oneregion is connected to an attachment object, and the locking mechanismis provided to be relatively movable with respect to the third supportportion along the length direction of the main body portion.
 5. Thestrap according to claim 4, wherein the second support portion isprovided with a first roller that is turnable about an axis parallelwith a width direction of the main body portion, and the second loopbackend portion of the main body portion is wound on an outer peripheralsurface of the first roller.
 6. The strap according to claim 3, whereinthe third support portion is provided with a second roller that isturnable about an axis parallel with a width direction of the main bodyportion, and the first loopback end portion of the main body portion iswound on an outer peripheral surface of the second roller.